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Drag Augmentation via Supersonic Retropropulsion for Atmospheric Deceleration
Start Date: 2/11/2014Start Time: 3:00 PM
End Date: 2/11/2014End Time: 4:00 PM


Dr. Noel Bakhtian
US Department of Energy
3:00 pm, February 11th, 2014 (Tuesday)
Phillips Hall 736

Hosted by Dr. Megan Leftwich (mleftwich@gwu.edu)

Supersonic retropropulsion (SRP) has been proposed as a candidate enabling technology for the entry, descent, and landing portion of future high-mass Mars missions. This presentation will cover work in the development of drag-based deceleration via SRP, including an analytical study determining the maximum drag potential of SRP systems, and validation of a steady, inviscid flow solver to model these complex flows for future optimization work. Deviating from the classic thrust-based SRP deceleration studies, we’ll explore augmentation of the decelerative forces experienced during Mars entry through a flow control approach which increases aerodynamic drag, based on SRP jet manipulation of the bow shock. Analytic drag models are developed based upon attainable shock physics seen in high-fidelity simulations of SRP jets. These flow models use SRP jets to recover shock losses normally associated with the strong high-Mach number bow shock on the entry vehicle. Partial recovery of stagnation pressure allows for significant deceleration at comparatively high altitudes without the burden of increased fuel mass, increasing both the mass of deliverable payloads and the payload mass fraction.

Working with the Advanced Supercomputing Division at NASA Ames Research Center, Noel’s primary research concentrated on development of a new technology for enabling future manned missions to Mars: supersonic retropropulsion for atmospheric entry and descent. Before her “high-speed” computational Ph.D. work at Stanford, she focused on the other end of the spectrum, experimental wind tunnel studies examining the aerodynamics of bird flight, while a Churchill Scholar at the University of Cambridge. In addition to her focus on aerospace topics, Noel is interested in energy, education, and the environment. In her spare time, she enjoys teaching kindergarten, college-age, and “retired” students about engineering and space, and is constantly refining her bottle rocket design for future outreach launches. Past work includes serving as the Energy Fellow in the Office of Senator Jeanne Shaheen (NH) and consulting for DARPA. Noel is currently working as an AAAS Fellow in the Wind and Water Power Technologies Office at the U.S. Department of Energy.
Contact:
Cindy Fields Arnold
202-994-7216
cfa@gwu.edu
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  • Workshop, Seminar or Conference

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